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xAI model product

Grok 4 Heavy

Grok 4 Heavy is the multi-agent version of Grok 4, released alongside the standard model in summer 2025.

Updated Aug 12, 2026. Default version: Grok-4 Heavy

Compare
LLMBoard score68.2Grok-4 Heavy
Coverage80%6 benchmark families
Context windowN/ATokens
Official input priceN/AOfficial price unavailable

On this page

  • Specification
  • Capability
  • Benchmarks
  • Arena
  • Runtime
  • Pricing
  • Versions
  • About
  • Compare
  • Similar models
  • FAQ

Grok 4 Heavy Specifications

Technical details for the model's default version.

Version
Grok-4 Heavy
Released
Unknown
Knowledge cutoff
Dec 31, 2024
Parameters
N/A
Context window
N/A
Max output
N/A
Inputs
image, text
Outputs
text
Open weights
No
License
Proprietary

Grok 4 Heavy Capability Profile

This profile uses the model's current scored version. Arena ratings and prices are shown separately.

Grok-4 Heavy category scores

Grok 4 Heavy Benchmark Results

Benchmark scores for Grok-4 Heavy.

6 rows
Columns

Show columns

HMMT2596.7%0125100.0%CAug 11, 2026
USAMO2561.9%02350.0%CAug 11, 2026
AIME 2025100.0%0411497.3%CAug 11, 2026
LiveCodeBench79.4%117386.1%CAug 11, 2026
Humanity's Last Exam50.7%199380.4%CAug 11, 2026
GPQA88.4%2823488.4%CAug 11, 2026

Grok 4 Heavy Arena Results

Preference and agent-evaluation results for the default version.

No Arena results

The default version does not have a matching Arena result yet.

Grok 4 Heavy Runtime Performance

Provider-specific output speed and catalog latency for Grok-4 Heavy. Runtime does not affect the capability score.

No runtime data

No provider-specific speed or latency record is linked to the default version yet.

Browse runtime rankings

Output Speed is generated output tokens received per second. Catalog latency is reported separately from observed provider TTFT.

Grok 4 Heavy Pricing

Official vendor API pricing appears first, followed by individual provider offers.

Official API
N/A
Official provider
N/A
Lowest third-party
N/A
Tracked offerings
0
No provider prices

The default version has no current input or output token prices.

Official prices use only the vendor's configured official Provider and positive standard USD PAYG rates. Third-party offers remain explicitly labeled.

Grok 4 Heavy Versions

Available versions of this model. The score column identifies the version used in the overall ranking.

1 rows
Columns

Show columns

Grok-4 HeavyN/A68.2N/AN/AN/ANoProprietary

What is Grok 4 Heavy?

Key information about Grok 4 Heavy and its available data.

Grok 4 Heavy is the multi-agent version of Grok 4, released alongside the standard model in summer 2025. This system spawns multiple Grok 4 agents in parallel that work independently on problems and then collaborate by comparing their solutions, similar to a study group.

The agents share insights and tricks they discover, with the system intelligently combining their work rather than simply using majority voting. Grok 4 Heavy uses approximately 10x more test-time compute than regular Grok 4, enabling it to solve significantly more complex problems.

On the Humanities Last Exam, it achieves over 50% accuracy on text-only problems, and it scored a perfect result on the AIME 2025 mathematics competition. The system represents a major advancement in multi-agent AI collaboration and reasoning capabilities.

Data as of 2026-08-11.

Grok 4 Heavy vs nearby models

Open a comparison with the three ranked models immediately above and below this model.

Grok 4 HeavyvsSeed 2.0 ProGrok 4 HeavyvsClaude Opus 4.5Grok 4 HeavyvsGemini 3.5 Flash CyberGrok 4 HeavyvsQwen3.6 PlusGrok 4 HeavyvsGemini 3 ProGrok 4 HeavyvsGLM 5

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FAQ

Common questions about Grok 4 Heavy.

When was Grok 4 Heavy released?

A release date is not available for the default version.

How much does Grok 4 Heavy cost?

No official standard PAYG price is currently available for Grok 4 Heavy.

Who created Grok 4 Heavy?

Grok 4 Heavy was created by xAI.

What is the context window for Grok 4 Heavy?

A context window is not available for the default version.

Is Grok 4 Heavy open weight?

No. The default version is not marked as having publicly available weights.

How many API providers offer Grok 4 Heavy?

No provider offering is currently linked to the default version.

What models should I compare Grok 4 Heavy with?

Nearby ranked alternatives include Seed 2.0 Pro, Claude Opus 4.5, Gemini 3.5 Flash Cyber.